This replacement filter cartridge replaces Unicel # C-4328 and Filbur # FC-2650 while it meets the OEM # C4328 specifications. It can bear the top load of 25 square foot and the best fit for Santanna, Conger Bros. This 9 3/16 inch long and 4 15/16 inch wide filter cartridge is closed at its top while it has 2 1/8 inch open hole at the bottom. By installing this filter cartridge you get clear and clear water for your pools and spas. This filter cartridge is very easy to install and made of superior grade of materials.